8342937183

202001, India.

Moderate to heavy galllng of the roots of Coamellna nudlflora. Ecllpta alba and Setarla yerticlllata growing In Allgarh, India, was found to be due to lnfectlon vtth Trlchodorus mirza!. Ali 3 planta are recorded for ' the first tlme as hosts for this nematode.

0 67 2-CANADA, 1970. “Research report of the Research Branch for 1969.° Ottawa: Canada Department of Agriculture, ix -f 370 pp. [Plant netnatodes pp. 4, 9-10, 41, 78, 105-106, 136-137, 139, 353—354.]

In reports from Canadian research stations it is recorded that resistance to HeteroJera rostochiensis in potato is present in 2 selections tested in New-foundland: in Prince Edward Island, yields of Empire birdsfoot trefoil (Lotus comiculatus) were morę reduced when PratyUnchus penetrans and Fusarium oxysporum together infected the plants than when either pathogen was present alone. In tests of the nematicides lannate and aldicarb for nematode control in tobacco in Quebec, the former was the bettcr. In a survey of tomato and cucumber houses in the Harrow region of Ontario over 50% were found to contain Meloidogyne sp. and 13% had Pratylenchus sp. The effects of nematicides on respiration rates of Caenorhabditis sp. and Aphelenchus avenae were invesdgated in the laboratory. In glasshouse studies Meloidogyne hapla caused morę severe damagc to ladino and double-cut red dovers [Trifolium repem var. ladino and T. pratemeJ than to lucerne and birdsfoot trefoil. The cabbagc var. EarJy Marvel, when grown at controlled soil tempera rur es of 22 and 26°C., was Idlied in 4 weeks by Fusarium oxysporum f. congluńnam whether or not Meloidogyne hapla or M. incognito was also present. The variety Market Prize was highly rei i s tan t while M arion Market was

0 6 7 3 —RHODESIA, 1971. “Tobacco Research Board of Rhodesia. Abridged Annual Report for the year ended 30th June, 1971.” Salisbury: Tobacco Research Board of Rhodesia, 20 pp. [Plant nematology p. 9.]

Nemaricide trialswith D-D/MITC,methylbromide, Bayer 68138, EDB, Mocap, furadan and Hoechst 2960 against Meloidogyne javanica on tobacco have been carried out in Rhodesia. Numbers of Heli-cotylenchus sp., Pratylenchus sp. and Rotylenchulus sp. have increased under mai ze and rice grown on day-loam soil for one scason at Banket. Rhizoctoma solani and Fusarium sp. have been coUected from nematode-infested tobacco and possible inter-actions are being investigated. Monoaenic cultures of P. brachyurus and P. eeae have been established on sterile lucerne callus; anempts to establish cultures of M. jauanica on lucerne, tomato and tobacco callus and on eacised roots of lucerne, tomato and tobacco have not been successful.

0 6 7 4 —U.S.A., 1970. “Research Progress 1970.” Buli. Wash. agric. Exp. Stn, No. 723, 51 pp. (Plant nematodes p. 47.)

Tests showed that rapid assay of lucerne scedlings for resistance to Ditylenchus dipsaci can be carried out on plants growing in flats. In experiments in which Verticillium dahliae f. menthae and Pratylenchus minyus were inoculated separately or together on peppermint [Mentha piperita]_t the concentration of free reducing sugars in the roots was infiuenced morę by the fungus than by the nematode. The results indicate a probable lack of correlation bec-ween the influence of P. minyus on wilt disease

and the concentration of free reducing sugars in peppermint roots. In fumigated soil planted with crops, populations of plant-parasitic nematodes increased under irrigation with canal water but not when wcll water was used. Standard soil fumigants (not namedj controlled rooc-knot nematodes [Meloidogyne) in potato.

0 5 7 6 —GRIFFIN, G. D., 1971. “Susccpdbility of commoa sainfoin to Meloidogyne hapla'' PI. Dis. Reptr, 55 (12), 1069-1072. (EnJ Agriculcural Research Service, USD A, Logan, Utah 84321, USA.

Sainfoin, Onobrychis uiciaefolia, was compared with lucerne, Medicago sativa var. Lahontan, for its rcaction to Meloidogyne hapla. AU 15 varietics tested were highly susceptible at 22 ± 4°C., with gaUs larger and locatcd further from the root tips than in lucerne. At 15 and 20°C. 3 varietics of sainfoin were morę $evcreły galled than lucerne but at 25 and 30°C. there was iittle difference. Larger galls were produced on sainfoin than on lucerne at aU temperacures. Morę nematodes invadcd sainfoin than lucerne at 15 and 20°C. but not at 25 or 30°C.: the percentage of !arvae reaching maturity was the same in both hosts. At 25°C. the greatest number of larvac entered and matured in both hosts. Sainfoin was less tolcranc than lucerne to M. hapla, as measured by scedling mortality, but tolerance in~ creased with the age of seedlings from 0 to 4 weeks.

057 6-HANDA, D. K.; MATHUR, B. N.; BHARGAVA, L. P._f 1971. “Occurrence of root-knot on pearl millet.” Indian J. Nematol., 1 (2), 244. [En] Plant Pathology Laboratory, Durga-pura, Jaipur-4, Rajasthan, India.

GaUs on the roots of Pennisetum typhoides formed by Meloidogyne jauanica and Af. incognito were recorded from many fields at Jaipur, India. This is claimed as tbe first record of Meloidogyne infestation on this crop.

0 6 7 7 RAI, B.B. Parasltlc nematodes associ-ated with malze. Allahabad Farmer (1969) 43 (5) 315-319 [En, 2 pl (unpaged)) Dep. of Blol., Allahabad Agric. Inst., Allahabad, (J.P., India.

In a study of the nematode populatlon In the rhizosphere of malze growing at Allahabad, India, greater numbers were found assoclated with unhealthy than with healthy plants. The chief specles found were Hoplolalmus indicua, Tylenchorhynchus brassłcae and Hellcotylenchus erythrlnae; found less freąuently were Heterodera, Tylenchus and Pratylenchus. Populations were smallest In” May and June when soli temperatures were high with Iow molsture eontent. Numbers were Increased from July to October, being greatest In July, especlally from around the roots of unhealthy plants.

0 6 7 8 -CHfiVRES-ROMAN, R.; GROSS, H. D.; SASSER, J. N., 1971. “The influence of selected nematode species and number of consecutive plamings of com and sorghum on forage produc-don, Chemical composition of plant and soil, and water use efficicncy.” [AbstracL) Nematropica, I (2), 40^-41, 46. [En, Es] Faculty of Agriculcure, College of Agricuitural Sciences, Univ. of Puerto Rico, Mayagiiez, Puerto Rico.

In surveys of forage maize and sorghum in Norih 168 Carolina, USA, nematodes of 9 plant-oarasitic